{"schema":"threatline.record/2","record":{"id":"CVE-2026-98568","aliases":[],"summary":"vxlan: use one headroom snapshot for neighbour replies","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: use one headroom snapshot for neighbour replies\n\nvxlan_na_create() samples LL_RESERVED_SPACE() to size the reply skb and then\nsamples it again to reserve headroom. A concurrent vxlan_changelink() can\nupdate needed_headroom between the two reads, creating a TOCTOU race. The\nsecond value can exceed the allocation and make the Ethernet header write out\nof bounds.\n\nThe race is reproducible on the unpatched kernel. It occurred when\nvxlan_na_create() generated a neighbour reply while vxlan_changelink() changed\nthe link headroom. KASAN caught a four-byte write two bytes beyond a 704-byte\nskbuff_small_head allocation.\n\nSnapshot the headroom once and use that value for both allocation and\nreservation.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98568","source_modified_at":"2026-10-19T09:21:53.865Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","lessThan":"45a67662bf8ce3aa5643accf98d328dfbb47eaf6","status":"affected","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","lessThan":"315d42ca39f69846662961c25dcf2bb07c350d14","status":"affected","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","lessThan":"a3c5eb6e382dd426a5e7eb08608897ed57167ff7","status":"affected","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","lessThan":"ff022fd9d0f0282c575e11778b96bd1b637503eb","status":"affected","versionType":"git"},{"version":"4b29dba9c085a4fb79058fb1c45a2f6257ca3dfa","lessThan":"481506a756dcd828ef42391cb08f38d8d96d38fc","status":"affected","versionType":"git"},{"version":"d8be18c52dbc94989f6d74637b731af39cd3d902","status":"affected","versionType":"git"},{"version":"3927dace523706cc00f808520eaf2125dd7c07b5","status":"affected","versionType":"git"},{"version":"3.12.18","lessThan":"3.13","status":"affected","versionType":"semver"},{"version":"3.13.10","lessThan":"3.14","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98568","source_modified_at":"2026-10-19T09:21:53.865Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"3.14","status":"affected"},{"version":"0","lessThan":"3.14","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.112","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.55","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.9","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98568","source_modified_at":"2026-10-19T09:21:53.865Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"45a67662bf8ce3aa5643accf98d328dfbb47eaf6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98568","source_modified_at":"2026-10-19T09:21:53.865Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"315d42ca39f69846662961c25dcf2bb07c350d14","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98568","source_modified_at":"2026-10-19T09:21:53.865Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"481506a756dcd828ef42391cb08f38d8d96d38fc","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98568","source_modified_at":"2026-10-19T09:21:53.865Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"3.13","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98568","source_modified_at":"2026-10-19T09:21:53.865Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"3.14","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.002,"percentile":0.0931,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:18:34.562Z","modified_at":"2026-10-19T09:21:53.865Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98568","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:21:53.865Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98568","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:21:53.865Z","content_hash":"97371d6933944e4c2d9dadcb126565007325de9f891f2eb689474420d114c263"}}